Class 7 Science Chapter 18 MCQ

Class 7 Science Chapter 18 MCQ (Multiple Choice Questions) of Wastewater Story in English Medium updated for CBSE Session 2021-2022. All the questions are important and useful of terminal exams and class tests.

MCQs are design in such a way it covers the entire chapter 18 of class 7 science. There are about 60 questions in all divided into 10 MCQ online tests.

Class 7 Science Chapter 18 MCQ for 2021-2022

Class: 7Science
Chapter: 18Wastewater Story
Contents: MCQ Online Quiz with answers

MCQ Tests with Answers for Class 7 Science Chapter 18

Q1

Which of the following is or are products of wastewater treatment?

[A]. Biogas
[B]. Sludge
[C]. Both biogas and sludge
[D]. Aerator
Q2

Rupali is writing some statements, choose the incorrect statement and help her:

[A]. The sewage released by houses and other buildings contain a large number of harmful substances and a disease-causing microorganism.
[B]. Drinking of water contaminated with sewage, spread disease in people which can even lead to death.
[C]. The discharge of untreated sewage into rivers can also kill fish and other aquatic animals.
[D]. None of the above.
Q3

Water polluted by various human activities cause a number of water-borne diseases. Which of the following is not a water-borne disease?

[A]. Cholera
[B]. Typhoid
[C]. Asthma
[D]. Dysentry
Q4

Which of the following statement is or are correct?

[A]. Water that is fit for use and safe for drinking is known as clean water.
[B]. The dissolved and suspended impurities present in water are called contaminants.
[C]. The gas that is produced by decomposition of sludge by the anaerobic bacteria is known as biogas.
[D]. All the above.




Q5

Select the one that is incorrect for wormy processing toilet:

[A]. It is a new method and has been recently tested in India.
[B]. In it the human excreta are treated by cockroaches and round worms.
[C]. In it the human excreta are completely converted into vermi-cakes.
[D]. It is an ideal, low water use toilet that is safe for processing of human waste.
Q6

Which of the following statements about ozone are correct?

[A]. It is essential for breathing of living organisms and it is used to disinfect water.
[B]. It is used to disinfect water and it absorbs ultraviolet rays.
[C]. It is essential for breathing of living organisms and it absorbs ultraviolet rays.
[D]. It is used to disinfect water and its proportion in air is about 3%.



Q7

Which of the following can be used to disinfect the clean water in a sewage treatment plant before releasing it into the distribution system?

[A]. Iodine and Ozone
[B]. Ozone and Oxygen
[C]. Ozone and Chlorine
[D]. Chlorine only
Q8

Which of the following is not a water-borne disease?

[A]. Cholera
[B]. Tuberculosis
[C]. Typhoid
[D]. Dysentery
Q9

One of the following type of trees are said to help in purifying wastewater quite rapidly when planted all along the sewage ponds. These are:

[A]. Eucalyptus tree
[B]. Ficus tree
[C]. Neem tree
[D]. Peepal trees
Q10

Which of the following are used for the safe disposal of human excreta in those areas where sewerage system does not exist and water supply is limited or not available at all?

[A]. Chemical toilets
[B]. Vacuum toilets
[C]. Septic tank toilets
[D]. Composting toilets

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